The Types of Cells That Lack a Membrane-Bound Nucleus

Prokaryotic cells do not contain organelles.
••• Hemera Technologies/ Images

If cells are essential to life, DNA in the cell nucleus -- the "brains" of the cell -- could be considered essential to the cell. It would seem obvious, then, that DNA is required for proper functioning. What about the nucleus itself? Is such a barrier between DNA and the rest of the cell also critical to the function of life? The answer, it turns out, is a resounding "no"! An entire class of organisms called prokaryotes do not have a separate nucleus within their cells.

Prokaryotes and Membranes

Living things on Earth are generally characterized as either prokaryotic or eukaryotic organisms. The difference between the two categories is that prokaryotes have no organelles separated from the rest of the cell by membranes. Prokaryotes, then, can survive just fine without a walled-off nucleus -- their chromosomes simply float free inside the cell. Our cells, on the other hand, are eukaryotic -- extra membranes are necessary for many human cell functions.

Related Articles

What Is a Extra Ring of DNA in Bacteria?
The Characteristics of the Mitochondria
Bacterial Cell Cytoplasm
Differences & Similarities Between Unicellular & Cellular
Which Event Will Follow DNA Replication in a Cell Cycle?
Evolutionary Relationships Between Prokaryotes & Eukaryotes
What Are the Biomolecules of Ribosomes?
The Difference Between Histone & Nonhistone
Characteristics of Microorganisms
Important Facts About the Kingdom Monera
Where Is the Nucleus Found in the Cell and Why?
Comparing & Contrasting DNA Replication in Prokaryotes...
What Are the Two Prokaryotic Kingdoms?
The Difference Between Prokaryotic and Eukaryotic Gene...
Relationships Between Mitosis in Eukaryotic Cells and...
Animalia Kingdom Facts
What Would Happen If a Cell Didn't Have Ribosomes?
Do All Cells Have Mitochondria?
What Are the Benefits of Ribosomes?
The Difference Between Anaphase, Interphase, Metaphase...

Dont Go!

We Have More Great Sciencing Articles!